Hints to Travellers: Scientific and General, Volume 1

A B C accuracy accurately adjustment alidade altitude aneroid approximate artificial horizon azimuth barometer base line bearing boiling-point thermometers centre chronometer circle clamp clinometer computed convenient Corr correct Cosine Parts Secant diagonal scale Diff difference of longitude distance divisions Error of Watch feet fixed points ground hour angle inches intersection latitude length logarithm longitude magnetic magnetic bearing mark mean measured mercury meridian method micrometer National Physical Laboratory Nautical Almanac object obtained occultation ordinary Parallax parallel perpendicular plane table plane-table plate position prismatic compass probable error rays reading refraction Right Ascension round of angles screw Secant Cotang seconds sextant shown sidereal Sine Parts Cosec star station statute mile subtended subtense instrument subtract survey TABLE XXXVII.-(continued tacheometer taken Tangent Cosec Tangent Parts Cotang tangent-screw telescope temperature transit theodolite traveller traverse triangle vernier vertical angles wires zenith zero